Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7661660 | Method and apparatus for aeration of a fluid | Matthew Burrows, Richard D. Helzer, David K. Berens | 2010-02-16 |
| 4431336 | Concrete prefinishing tool | Stanley A. Nightengale | 1984-02-14 |